Is the similarity theory adequate to describe turbulent surface fluxes at the LBA-ECO agricultural site in Santarém?
Osvaldo
Luiz Leal de
Moraes, UFSM, Santa Maria, RS, moraes@mail1.ufsm.br
(Presenting)
Otávio
Costa
Acevedo, UFSM, Santa Maria, RS, otavio@smail.ufsm.br
David
Roy
Fitzjarrald, SUNY at Albany, NY, fitz@asrc.cestm.albany.edu
Ricardo
Kendi
Sakai, SUNY at Albany, NY, sakai@asrc.cestm.albany.edu
Hans
Rogério
Zimermann, UFSM, Santa Maria, RS, hans@w3.ufsm.br
Rodrigo
da
Silva, UFSM, Santa Maria, RS, rodrigo@asrc.cestm.albany.edu
Matthew
J.
Czikowsky, SUNY at Albany, NY, matt@asrc.cestm.albany.edu
Ralf
M.
Staebler, SUNY at Albany, NY, ralf.staebler@ec.gc.ca
Vagner
Anabor, UFSM, Santa Maria, RS, anabor@tutopia.com.br
The description of the Surface Boundary Layer (SL) is usually described in terms of similarity theories. Although the atmospheric boundary layer over land evolves continuously in response to the heating and cooling of the earth’s surface, it does have distinct states that can be described in fairly simple terms. The picture that emerged from the research activity is that the general behavior of the boundary layer is described in terms of simple empirical statistics if the large-scale weather patterns are specified and the topography is not too complicated. Usually these theories have been used to described dynamics and thermodynamics parameters and only few studies have focused in the statistics of the Carbon flux and Carbon concentration. The purpose of this paper is the analysis of the turbulence statistics (standard deviations) as well as mean profiles of velocities, temperature, humidity and CO2 in terms of the appropriate scales derived from surface layer similarity theory. Data were collected in an agricultural field in eastern Amazon (3.012oS; 54.537oW). A 20 m micrometeorological tower with and eddy covariance system and an infrared gas analyzer (installed at 8.75m) have been used for turbulence measurements. Slow response sensors located at various heights have been used for profiles measurements. Preliminary results show that good results are obtained after appropriate data analysis.
Submetido por Osvaldo Luiz Leal de Moraes em 25-MAR-2004
Tema Científico do LBA: CD (Armazenamento e Trocas de Carbono)